Mitt Romney may be consolidating his lead over Rick Santorum in the race to secure the GOP nomination picking up an endorsement from Marco Rubio on Wednesday night and from members of the Bush family. But the Republican presidential hopeful is facing a new and potentially very serious crisis in his campaign.

The former Massachusetts governor's most serious problem going forward-- one that the Wall Street Journal called attention to in early March -- is that his negative rating exceeds his positive rating by double digits.

Right now, former Governor Romney is at least as unpalatable to voters as former Majority leader Dole was back in 1996.